497 research outputs found
Multicomponent diffusion and energy characteristics of partially ionized plasma in the ionosphere of a planet
The problem of energy and multicomponent ambipolar diffusion of plasma in the lower ionosphere of a planet with a weak magnetic field is considered
Quantum interference effects in a system of two tunnel point-contacts in the presence of single scatterer: simulation of a double-tip STM experiment
The conductance of systems containing two tunnel point-contacts and a single
subsurface scatterer is investigated theoretically. The problem is solved in
the approximation of s-wave scattering giving analytical expressions for the
wave functions and for the conductance of the system. Conductance oscillations
resulting from the interference of electron waves passing through different
contacts and their interference with the waves scattered by the defect are
analyzed. The prospect for determining the depth of the impurity below the
metal surface by using the dependence of the conductance as a function of the
distance between the contacts is discussed. It is shown that the application of
an external magnetic field results in Aharonov-Bohm type oscillations in the
conductance, the period of which allows detection of the depth of the defect in
a double tip STM experiment.Comment: 11 pages, 4 figures, to be published in Fiz. Nizk. Temp. (Low Temp.
Phys.), V.37, No.1 (2011) corrected figure
Kinematic power corrections in off-forward hard reactions
We develop a general approach to the calculation of kinematic corrections
~t/Q^2, ~m^2/Q^2 in hard processes which involve momentum transfer from the
initial to the final hadron state. As the principal result, the complete
expression is derived for the time-ordered product of two electromagnetic
currents that includes all kinematic corrections to twist-four accuracy. The
results are immediately applicable e.g. to the studies of deeply-virtual
Compton scattering.Comment: 4 page
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